Fixation chart



J. COPELAND Feb. 3, 1931.

FIXATION CHART Filed Feb. 27, 1923 Patented Feb. 3, 1931 lrss-f mason-f JACOB CCPELAND, on CHICAGO, ILLINOIS FIXATION CHART 'f Application filed February 27, 1928. Serial No. 257,167.

Inaddition to the above, it is a iurtherob- Vjeet to produce a `Construction, having the above advantages, and to provide said con 15 ,struction with means, whereby said holder may be moved or shifted'relatively to the support with which it may be attached, and thereby allow the holder, inthe event of its being attachedto the head of .the refracv20tionist, to be shifted from yone eye to Yan- 1 other, or to an intermediate position between the eyes, to thereby arrange the holder in a manner to allow the use of a retinosc-ope, or other instrument, to facilitate theexamina-v the refractionist may make his examination ofconditions with the eye of the patient in 3U various positions.

It is another object of the invention to pro?,`

Y vide the device with meanswhereby theraXes of said Chart holder are maintained in horizontal and vertical alignment, regardless of 35V the positions which said charts and chart holder may assume upon movement thereof to and from the f erred to.

tion, in which'the chart holder may be rotated with respect to the element in which it is mounted, 'and thereby provide a Vmeans whereby certa-in other tests maybe 'accom-f plished, such as for instance, a near ,point astigmatism test,-wherein rotationof the Chart isof advantage. Y "j In addition to the above, it is also an obj ect tov employ, an element which providesv "a mounting, whereby the devicemay be removablymounted .with respect to a support, such positions thereofk above re-y f: The invention I y n of means whereby*A variousj chartsxma-y be asv-a headgearV secured to theheadof the refractionist, or be removably mountedrelatively to a bar of a photoptometer the mounty inghaving,means,1whereby electrcal--connec-f tion may be formed between a source-of cursa rent. and the illuminating element forlthe! p Charts..V Y "1 f The invention has these and other. objects.,

`all of which will'be expiainedin detail, and more lreadily understood when readinV con- 'cti v.junction 'with the faccompanyingdrawings, i

whichillustrate oneV construction, wherebyj Y, the'above and otheradvantages maybeao` Y scomplished,it beingV obvious,'however` that uchanges-and modifications may be resorted to` without departing from the.. spirit of the ap- '7.

pended Claims orminga parthereof. l n ln the drawings y l Fig. lis a .front view of the device, associ# ated with a headband, showing in dotted lines 1f Y the changed positions which the device may Fig. 2 isa sideviewfoi1 ythe device shown in i I ,Fig l; 25 tion of a patientseye, or toallow reeuse of both eyes of therefraotionist, and to also .cause the patientl to position hisv eye, so? that.

applied to aMaddoX bar;

liligQBfisl a side viewv showing vthe device of 1'; and 1 Fis-1 fiee riv offfine ofpthesevmii kCharts whichv may lbe employed 1n thedevrC-e agi One embodimentoi the Vinvention Contem- [platesl .the provision oi'a structure whichA may vbe removably vassociated'with'avhead band 10,V having. a -bracket, generally designatednll, securedthereto, the bracket being -z'f providedfto allowthe iXation Chart holder, generally designated'lQ, to be detachablycon- .Y Y f :nected therewith.` 'i The chartholderisde-v It is also an object to provide aconstruesignedV to allowit to beshifted ironia posi tion between the eyes ofv thefreiractionist to .3a

either one side or vthe other in front of eithereye; thus allowingtheholder to beY Varranged to permit free: use ofV both eyes oi lother eyefduring the examination of; the `eyes of the' patient. v Y l. p a contemplatesy the provision interchangeably mounted with respect to the chart holder and the illumination of the chart, and to provide a construction, whereby the holder may be shifted from one eye to the other of the refractionist, which construction will maintain the horizontal and vertical aires in their vertical and horizontal relation, regardless Vof the position which the chart holder is caused to assume upon movement thereof relatively to the eyes of the refractionist.

The chart holder is inovably mounted with respect' to its mounting or head band, for the further reason to allow said holder to be arranged in a manner to position the eye of the patient, so that examination thereof mayy be accomplished with the eye of the patient indifferent positions.

. Provision is alsomade for rotating the.

'l i b chart holder, so that certain other tests, such'f asanear point astigmatism testniay be accomplished, should this be found necessary or desirable.

, a housing for rthe contact spring 25, whichV The device, as illustrated, contemplates the use of a member 13, whichis designed to be detachably'niounted withrespect to the bracketlll, offra vhead gearband 10, or uponA aphotoptometer rod, and to provide a sup'- port for the reflector 14, which is mounted yfor movement inlateral directions in the manner and for the purpose above described. This reflector 14 is secured to the member 13, through the medium of the' arms 15 andv 16, which are, respectively, pivotally connected at one end with the member 13 at 1'? and 18, and have their opposite ends connected with the reflector support and lamp socket, gener ally designated 19. The connections betweenthe arms and the member 13 provide a means,

whereby the arinsand the elem-ents connected ytherewith are frictionally held in any oftheir various positions of adjustment, and totliisend a split washer 2O is located between the arms and a portion forming part of the connections17 and 18, by which the arms are connected with the member 13, which will frictionally hold said arms and certain parts connected therewith in their various positions of adjustment. Y f The lamp socket and reflector support 19 is composed of aplate 21, and a correspondl ingly shaped insulating member 22, the plate 21 being provided with the tubular portion 23, which is internally threaded to receive the lamp 24, and also provides a means whereby the reflector is detachably mounted with relation to the remaining structure.

The insulating member is recessed to provide is provided to engage the `center 'contact of the lamp 24, the contact spring being connected with one of thevv arms, such as 16, the other arm as 15, being in electrical connection with the plate 21. The opposite ends of said arms,,whicharesecured to the sulating member to allow a connector 31,.l

having the conductors 32 and extending therefrom to provide and'complete a connection between said conductors '28 and 29,7` and a cell (not shown) which may be stored upon the personY of the refractionist.

Vitis manifest that the arrangement just' described provides a VmeansV whereby the lamp 2li, may be illuminated with the reiiector and chart holder'arianged in any ofi Vits va ious positions of adjustment. p

The reflector 14 is closed by the velementY '34, which is provided with an aperture 35, having the guideways36-36, arranged upon *oppositey sides ofthe opening. The guide-' ways are providedto receive anyone of several different charts 37,' and to hold` said" charts in front of thelamp24, when arranged to close the opening; l I I It is, ofcourse, understood that any of the several charts Amay' be interchangeably arranged across the opening, depending uponl the test which the refractionist desires to perform, as for instance', should the refraction'-v ist desire to subject "the patient to a disasf sociation, dynamic, retinoscopic, or accom-v modation amplitude test, the various ,chartsY employed will be provided with means, whereby i plished.V

Provision is made whereby vthe element 3d,

'having the opening 35, iskrotatable, this be` ing of advantagein performing certain tests,

such as a near pointlastiginatism test, in.` e which it is advantageous to rotate the chart before the eyes of the patient. p Y

The reiiector may be provided with indicia ico these' or other tests may be accoinl 38, corresponding to all, or part of the meridaV Y ians of a circle, and the chart holder maybe provided with afknob 38', whereby the chart holder may be rotated'a-nd said holder may Y.

also be providedv with a niark, such as 39, which will advise the refractionist as to the degree of angularity, to which chart holder has been' rotated. y n

It will be noted that the manner of supf porting the reflector and theiohait holder,

that is, .by means of the arms 15 and 16 connected, as illustrated, provides a pai-'allelesA gram, which insuresagainst rotation ofthe chart holder upon movement thereof4 to and, from one eye or the other of the refractionthe rotatable l ist, which, thus, at all times maintains the axes of said charts in proper horizontal and vertical relation, regardless of the position which said chart'holder is caused to assume upon movement thereof from one eye to another, or to and from an intermediate position. i

The device is also capableY of use in conjunction with a rod of a photoptometer, such as shownin F ig. 3, it being evident that this may be accomplished by providing a support or standard 40, which is movably arl ranged upon the bar 41, the standard havingy v the part 42 provided for the separableattachment of the chart elements.

From the foregoing explanation of the holder and its associated construction and operation of the deviceitV is manifest that a means is provided, whereby any desirable chart may be interchangeably mounted and illuminated, and that said"device may be shiftedr from oney position to another, without varyingthe position of the operation with a `bar of a photoptometer.

axes of vthe Vchart or chart holder. o

It is also manifest that a construction is provided, whereby the chartand chart holder may be rotated relativelyrto afsupport therefor into coincidence with any meridian.

. In addition,vit is manifest vthat the structure is also capable of association .and co- I-Iaving described the invention what .I

` claim and desire to cover by Letters Pat- Vent is: i

l. In a. device of therclassdescribed, the

vcombination-of a mounting element, a chartyholder and lampV support and a connectiony between said mounting element and said support,the elements of said connection permit- 'ting lateral movement of said support and including means for iixedly holding said support in one of several positions of adjustment v and describing a parallelogram whereby the support is movable and the alignment of a chart holder carried thereby is maintained during movement relatively tosaid mountingelement.

2.V In a device of the class described, the combination of a mounting element, a chart holder and-lamp support, for illuminating the chart holder, a pair of links pivotally connected with saidmounting element and chart holder and. lamp support, and means for iixedly supporting said chart `holder in vari- ,ous positions of adjustment relatively tothe mounting element.

3. In a device of the f combinationv of a mounting element, a chart holder, and means carried by the chartV holder for illuminating Ythe chart holder, a pair of pivoted links connecting said mounting element and chart holder together, and means for holding said chart holder in various positions of adjustment relatively to thev mounting element, said links providing conductors chart holder.

4. In `a device of the class described, the combination of a mounting element, a reiector providing a chart holder, means for 'for the illuminating means carried by the 'n one side of thecenter of said mounting element to' the other, means for iXedly support- 'ing said chart holder in either of said'positions,'and means lfor maintaining the horil zontal alignment of the axis of said chart holder when said chart holder is'arranged upon one side or theother of said center. Y

6. In a device of the class described, the combination of. amounting element, a chart y holder secured for vmovement-to said mount ing.elem'ent,saidchart holder being movable from one side ofthe center of'said mounting element to the other, and said chart holder including means whereby a chart may beroA tated relatively to the chart holder.

7. Ina device of the class described, the i combinationof a mounting element, a chartholder, and means for lconnecting said charty holder and mounting eil-ement together, said Y means providing means whereby said chart holder may be moved laterally in opposite directions, and providing means lfor holding said holder against rotation during vsaid movement.`

8. In a'device of the class described, the combination of a mounting element, a chart holder, said chart holder being movable laterally in opposite directions, means for lholding saidV holder against rotation upon said movement, and said chart holder including an element mounted for rotation.

In witness whereof, I hereunto subscribe my name this 20th day of January,-A. I). 1928.

JACOB COPELAND. o

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